Just a rambling necro-post, but ironically just as it's become possible to downgrade an iPhone4 and below to achieve Consolidated.db 4096c9ec676f2847dc283405900e284a7c815836 functionality, that party seems to be over. Along the off-topic direction this thread has veered, BE AWARE: ANY jailbroken app...

perhaps your phone already has a gpsd process running? My Samsung GS3 doesn't
you could just do an ssh port-forward over usb tether to access it.

on iPhone I can highly recommend "gps2ip"